| 1 |
dimitri |
1.1 |
Initialization (myTime .EQ. startTime in MITgcm) |
| 2 |
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| 3 |
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===> Ocean Sends/ Ice Receives (fields that are sent only once) |
| 4 |
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deltatimestep 1 Real*8 TimeIntervalTag |
| 5 |
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grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
| 6 |
dimitri |
1.7 |
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| 7 |
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xC Nx*Ny Real*8 xCtag |
| 8 |
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yC Nx*Ny Real*8 yCtag |
| 9 |
dimitri |
1.5 |
xG Nx*Ny Real*8 xGtag |
| 10 |
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yG Nx*Ny Real*8 yGtag |
| 11 |
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dxG Nx*Ny Real*8 dxGtag |
| 12 |
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dyG Nx*Ny Real*8 dxGtag |
| 13 |
dimitri |
1.7 |
AngleCS Nx*Ny Real*8 aCStag |
| 14 |
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AngleSN Nx*Ny Real*8 aSNtag |
| 15 |
dimitri |
1.5 |
hFacC Nx*Ny Real*8 hFacCtag |
| 16 |
dimitri |
1.1 |
ice area Nx*Ny Real*8 AreaTag |
| 17 |
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ice thickness Nx*Ny Real*8 HeffTag |
| 18 |
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ice salinity Nx*Ny Real*8 HsaltTag |
| 19 |
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snow thickness Nx*Ny Real*8 HsnowTag |
| 20 |
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| 21 |
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===================================== |
| 22 |
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| 23 |
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Each deltatimestep: |
| 24 |
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| 25 |
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===> Ocean Sends/Ice Receives |
| 26 |
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ocean model time 1 Real*8 OceanTimeTag |
| 27 |
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boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
| 28 |
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boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
| 29 |
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boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
| 30 |
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boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
| 31 |
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boundary u ice 2*(Nx+Ny)-6 Real*8 UiceBcTag |
| 32 |
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boundary v ice 2*(Nx+Ny)-6 Real*8 ViceBcTag |
| 33 |
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u-wind velocity Nx*Ny Real*8 UwindTag |
| 34 |
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v-wind velocity Nx*Ny Real*8 VwindTag |
| 35 |
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downward longwave radiation Nx*Ny Real*8 LwDownTag |
| 36 |
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downward shortwave radiation Nx*Ny Real*8 SwDownTag |
| 37 |
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air temperature Nx*Ny Real*8 AtempTag |
| 38 |
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humidity Nx*Ny Real*8 AqhTag |
| 39 |
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precipitation Nx*Ny Real*8 PrecipTag |
| 40 |
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ocean surface temperature Nx*Ny Real*8 SstTag |
| 41 |
dimitri |
1.3 |
ocean surface salinity Nx*Ny Real*8 SssTag |
| 42 |
dimitri |
1.1 |
surface u current Nx*Ny Real*8 UvelTag |
| 43 |
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surface v current Nx*Ny Real*8 VvelTag |
| 44 |
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| 45 |
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===> Ice Sends/Ocean Receives |
| 46 |
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ice model time 1 Real*8 IceTimeTag |
| 47 |
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ice area Nx*Ny Real*8 AreaTag |
| 48 |
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ice thickness Nx*Ny Real*8 HeffTag |
| 49 |
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ice salinity Nx*Ny Real*8 HsaltTag |
| 50 |
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snow thickness Nx*Ny Real*8 HsnowTag |
| 51 |
dimitri |
1.4 |
u ice velocity Nx*Ny Real*8 UiceTag |
| 52 |
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v ice velocity Nx*Ny Real*8 ViceTag |
| 53 |
dimitri |
1.1 |
u surface stress Nx*Ny Real*8 UstressTag |
| 54 |
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v surface stress Nx*Ny Real*8 VstressTag |
| 55 |
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residual shortwave Nx*Ny Real*8 SwResidTag |
| 56 |
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heat flux Nx*Ny Real*8 HeatFluxTag |
| 57 |
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freshwater flux Nx*Ny Real*8 WaterFluxTag |
| 58 |
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salt flux Nx*Ny Real*8 SaltFluxTag |
| 59 |
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| 60 |
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===================================== |
| 61 |
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| 62 |
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DETAILS: |
| 63 |
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| 64 |
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| 65 |
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| 66 |
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1. start and initialize ocean + ice codes |
| 67 |
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| 68 |
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=========================================================== |
| 69 |
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| 70 |
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2. ocean sends |
| 71 |
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| 72 |
dimitri |
1.2 |
**** initial time step only ******************************* |
| 73 |
dimitri |
1.1 |
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| 74 |
dimitri |
1.2 |
deltatimestep 1 Real*8 TimeIntervalTag |
| 75 |
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| 76 |
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grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
| 77 |
dimitri |
1.1 |
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| 78 |
dimitri |
1.5 |
Some grid information - see MITgcm/model/inc/GRID.h for details: |
| 79 |
dimitri |
1.7 |
xC :: longitude East of center of grid cell |
| 80 |
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yC ::latitude North of center of grid cell |
| 81 |
dimitri |
1.5 |
xG :: longitude East of SouthWest corner |
| 82 |
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yG :: latitude North of SouthWest corner |
| 83 |
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dxG :: distance in m between SouthWest and SouthEast corner |
| 84 |
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dyG :: distance in m between SouthWest and NorthEast corner |
| 85 |
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| 86 |
dimitri |
1.7 |
aCS :: cosine(alpha) relative to geographic direction at grid cell center |
| 87 |
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aSN :: sine(alpha) relative to geographic direction at grid cell center |
| 88 |
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| 89 |
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alpha = angle of model uVel direction vs geographical East |
| 90 |
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= angle of model vVel direction vs geographical North |
| 91 |
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(AngleCS*uVelc - AngleSN*vVelc, AngleSN*uVelc + AngleCN*vVelc) |
| 92 |
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rotates model velocity to geographical coordinates, where |
| 93 |
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(uVelc,vVelc) is model velocity vector at center of grid cell |
| 94 |
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| 95 |
dimitri |
1.1 |
Then on tracer grid: |
| 96 |
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| 97 |
dimitri |
1.5 |
hFacC :: landmask of center of grid cell, 0 is land, >0 is ocean |
| 98 |
dimitri |
1.1 |
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| 99 |
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initial ice area (fractional: 0-1) at the tracer points |
| 100 |
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C AREA - fractional ice-covered area in m^2/m^2 |
| 101 |
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C at center of grid, i.e., tracer point |
| 102 |
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C 0 is no cover, 1 is 100% cover |
| 103 |
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| 104 |
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initial ice thickness (mean thickness in the grid box in m) |
| 105 |
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actual thickness for single-class ice would be thickness/area |
| 106 |
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at the tracer points |
| 107 |
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C HEFF - effective ice thickness in m |
| 108 |
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C at center of grid, i.e., tracer point |
| 109 |
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C note: for non-zero AREA, actual ice |
| 110 |
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C thickness is HEFF / AREA |
| 111 |
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| 112 |
dimitri |
1.2 |
initial ice salinity at the tracer points |
| 113 |
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C HSALT - effective sea ice salinity in g/m^2 |
| 114 |
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C at center of grid, i.e., tracer point |
| 115 |
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| 116 |
dimitri |
1.1 |
initial snow thickness (mean thickness, m) at the tracer points |
| 117 |
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C HSNOW - effective snow thickness in m |
| 118 |
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C at center of grid, i.e., tracer point |
| 119 |
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C note: for non-zero AREA, actual snow |
| 120 |
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C thickness is HSNOW / AREA |
| 121 |
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| 122 |
dimitri |
1.2 |
**** every time step ************************************** |
| 123 |
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| 124 |
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ocean model time "myTime" (s) |
| 125 |
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| 126 |
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boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
| 127 |
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| 128 |
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boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
| 129 |
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| 130 |
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boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
| 131 |
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| 132 |
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boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
| 133 |
dimitri |
1.1 |
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| 134 |
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open boundary u-ice velocity |
| 135 |
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specified at the inside edge of the outer grid cells |
| 136 |
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southwest C-grid locations for normal component and at the |
| 137 |
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southwest C-grid locations for tangential |
| 138 |
dimitri |
1.4 |
C UICE - zonal ice velocity in m/s at South-West C-grid U point |
| 139 |
dimitri |
1.1 |
C >0 from West to East |
| 140 |
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| 141 |
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open boundary v-ice velocity |
| 142 |
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specified at the inside edge of the outer grid cells |
| 143 |
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southwest C-grid locations for normal component and at the |
| 144 |
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southwest C-grid locations for tangential |
| 145 |
dimitri |
1.4 |
C VICE - meridional ice velocity in m/s at South-West C-grid V point |
| 146 |
dimitri |
1.1 |
C >0 from South to North |
| 147 |
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| 148 |
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10-m u-wind at the tracer points |
| 149 |
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c uwind :: Surface (10-m) zonal wind velocity in m/s |
| 150 |
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c > 0 for increase in uVel, which is west to |
| 151 |
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c east for cartesian and spherical polar grids |
| 152 |
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c Typical range: -10 < uwind < 10 |
| 153 |
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c Input or input/output field |
| 154 |
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| 155 |
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10-m v-wind at the tracer points |
| 156 |
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c vwind :: Surface (10-m) meridional wind velocity in m/s |
| 157 |
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c > 0 for increase in vVel, which is south to |
| 158 |
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c north for cartesian and spherical polar grids |
| 159 |
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c Typical range: -10 < vwind < 10 |
| 160 |
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c Input or input/output field |
| 161 |
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| 162 |
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downward longwave at the tracer points |
| 163 |
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c lwdown :: Downward longwave radiation in W/m^2 |
| 164 |
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c > 0 for increase in theta (ocean warming) |
| 165 |
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c Typical range: 50 < lwdown < 450 |
| 166 |
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c Input/output field |
| 167 |
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| 168 |
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downward shortwave at the tracer points |
| 169 |
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c swdown :: Downward shortwave radiation in W/m^2 |
| 170 |
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c > 0 for increase in theta (ocean warming) |
| 171 |
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c Typical range: 0 < swdown < 450 |
| 172 |
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c Input/output field |
| 173 |
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| 174 |
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2-m air temperature at the tracer points |
| 175 |
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c atemp :: Surface (2-m) air temperature in deg K |
| 176 |
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c Typical range: 200 < atemp < 300 |
| 177 |
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c Input or input/output field |
| 178 |
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| 179 |
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2-m humidity at the tracer points |
| 180 |
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c aqh :: Surface (2m) specific humidity in kg/kg |
| 181 |
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c Typical range: 0 < aqh < 0.02 |
| 182 |
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c Input or input/output field |
| 183 |
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| 184 |
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precipitation at the tracer points |
| 185 |
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c precip :: Precipitation in m/s |
| 186 |
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c > 0 for decrease in salt (ocean salinity) |
| 187 |
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c Typical range: 0 < precip < 5e-7 |
| 188 |
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c Input or input/output field |
| 189 |
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| 190 |
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sea surface temperature at the tracer points |
| 191 |
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C theta - potential temperature (oC, held at pressure/tracer point) |
| 192 |
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| 193 |
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sea surface u-vel |
| 194 |
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C uVel - zonal velocity (m/s, i=1 held at western face) |
| 195 |
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at southwest c-grid locations |
| 196 |
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| 197 |
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sea surface v-vel |
| 198 |
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C vVel - meridional velocity (m/s, j=1 held at southern face) |
| 199 |
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at southwest c-grid locations |
| 200 |
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| 201 |
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=========================================================== |
| 202 |
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| 203 |
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3. ice receives 2., computes initial ice conditions and sends on tracer grid |
| 204 |
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| 205 |
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ice model time (s) |
| 206 |
dimitri |
1.3 |
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| 207 |
dimitri |
1.1 |
ice area at tracer point |
| 208 |
dimitri |
1.3 |
C AREA :: fractional ice-covered area in m^2/m^2 |
| 209 |
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C at center of grid, i.e., tracer point |
| 210 |
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C 0 is no cover, 1 is 100% cover |
| 211 |
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| 212 |
dimitri |
1.1 |
ice thickness at tracer point |
| 213 |
dimitri |
1.3 |
C HEFF :: effective ice thickness in m |
| 214 |
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C at center of grid, i.e., tracer point |
| 215 |
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C note: for non-zero AREA, |
| 216 |
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C actual ice thickness is HEFF / AREA |
| 217 |
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| 218 |
dimitri |
1.1 |
ice salinity at tracer point |
| 219 |
dimitri |
1.3 |
C HSALT :: effective sea ice salinity in g/m^2 |
| 220 |
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C at center of grid, i.e., tracer point |
| 221 |
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| 222 |
dimitri |
1.1 |
snow thickness at tracer point |
| 223 |
dimitri |
1.3 |
C HSNOW :: effective snow thickness in m |
| 224 |
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C at center of grid, i.e., tracer point |
| 225 |
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C note: for non-zero AREA, actual snow thickness is HSNOW / AREA |
| 226 |
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| 227 |
dimitri |
1.4 |
u ice velocity at southwest c-grid locations |
| 228 |
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C UICE - zonal ice velocity in m/s at South-West C-grid U point |
| 229 |
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C >0 from West to East |
| 230 |
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| 231 |
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v ice velocity at southwest c-grid locations |
| 232 |
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C VICE - meridional ice velocity in m/s at South-West C-grid V point |
| 233 |
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C >0 from South to North |
| 234 |
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| 235 |
dimitri |
1.3 |
u-stress under ice at southwest c-grid locations |
| 236 |
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C fu :: Zonal surface wind stress in N/m^2 |
| 237 |
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C > 0 for increase in uVel, which is west to |
| 238 |
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C east for cartesian and spherical polar grids |
| 239 |
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C Typical range: -0.5 < fu < 0.5 |
| 240 |
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C Southwest C-grid U point |
| 241 |
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| 242 |
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v-stress under ice at southwest c-grid locations |
| 243 |
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C fv :: Meridional surface wind stress in N/m^2 |
| 244 |
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C > 0 for increase in vVel, which is south to |
| 245 |
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C north for cartesian and spherical polar grids |
| 246 |
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C Typical range: -0.5 < fv < 0.5 |
| 247 |
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C Southwest C-grid V point |
| 248 |
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| 249 |
dimitri |
1.1 |
residual shortwave under ice at tracer point |
| 250 |
dimitri |
1.3 |
C Qsw :: Net upward shortwave radiation in W/m^2 |
| 251 |
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C Qsw = - ( downward - ice and snow absorption - reflected ) |
| 252 |
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C > 0 for decrease in theta (ocean cooling) |
| 253 |
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C Typical range: -350 < Qsw < 0 |
| 254 |
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C Southwest C-grid tracer point |
| 255 |
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| 256 |
dimitri |
1.1 |
heat flux (less shortwave) at tracer point |
| 257 |
dimitri |
1.6 |
C HeatFlux |
| 258 |
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C :: Upward surface heat flux (excluding shortwave) in W/m^2 |
| 259 |
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C HeatFlux = latent + sensible + net longwave |
| 260 |
dimitri |
1.3 |
C > 0 for decrease in theta (ocean cooling) |
| 261 |
dimitri |
1.8 |
C Typical range: -250 < HeatFlux < 950 |
| 262 |
dimitri |
1.3 |
C Southwest C-grid tracer point |
| 263 |
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| 264 |
dimitri |
1.1 |
freshwater flux at tracer point |
| 265 |
dimitri |
1.3 |
C EmPmR :: Net upward freshwater flux in kg/m2/s |
| 266 |
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C EmPmR = Evaporation - precipitation - runoff |
| 267 |
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C > 0 for increase in salt (ocean salinity) |
| 268 |
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C Typical range: -1e-4 < EmPmR < 1e-4 |
| 269 |
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C Southwest C-grid tracer point |
| 270 |
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C NOTE: for backward compatibility EmPmRfile is specified in |
| 271 |
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C m/s when using external_fields_load.F. It is converted |
| 272 |
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C to kg/m2/s by multiplying by rhoConstFresh. |
| 273 |
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| 274 |
dimitri |
1.1 |
salt flux at tracer point |
| 275 |
dimitri |
1.3 |
C saltFlux :: Net upward salt flux in psu.kg/m^2/s |
| 276 |
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C flux of Salt taken out of the ocean per time unit (second). |
| 277 |
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C Note: a) only used when salty sea-ice forms or melts. |
| 278 |
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C b) units: when salinity (unit= psu) is expressed |
| 279 |
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C in g/kg, saltFlux unit becomes g/m^2/s. |
| 280 |
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C > 0 for decrease in SSS. |
| 281 |
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C Southwest C-grid tracer point |
| 282 |
dimitri |
1.1 |
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| 283 |
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=========================================================== |
| 284 |
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| 285 |
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4a. ice model steps forward by deltatimestep |
| 286 |
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initially hardwired to 20 minutes |
| 287 |
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| 288 |
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4b. ocean model receives 3. and steps forward by deltatimestep |
| 289 |
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initially hardwired to 20 minutes |
| 290 |
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| 291 |
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=========================================================== |
| 292 |
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| 293 |
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5a. ocean sends on tracer grid |
| 294 |
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timestep |
| 295 |
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open boundary ice area at tracer point |
| 296 |
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open boundary ice thickness at tracer point |
| 297 |
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open boundary snow thickness at tracer point |
| 298 |
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open boundary ice salinity at tracer point |
| 299 |
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open boundary u-ice velocity (see 2.) |
| 300 |
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open boundary v-ice velocity (see 2.) |
| 301 |
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10-m u-wind (see 2.) |
| 302 |
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10-m v-wind (see 2.) |
| 303 |
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downward longwave (see 2.) |
| 304 |
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downward shortwave (see 2.) |
| 305 |
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2-m air temperature (see 2.) |
| 306 |
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2-m humidity (see 2.) |
| 307 |
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precipitation (see 2.) |
| 308 |
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sea surface temperature (see 2.) |
| 309 |
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sea surface u-vel (see 2.) |
| 310 |
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sea surface v-vel (see 2.) |
| 311 |
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| 312 |
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=========================================================== |
| 313 |
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| 314 |
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5b. ice sends on tracer grid |
| 315 |
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| 316 |
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ice model time (s) |
| 317 |
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ice area at tracer point |
| 318 |
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ice thickness at tracer point |
| 319 |
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ice salinity at tracer point |
| 320 |
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snow thickness at tracer point |
| 321 |
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u-stress under ice at southwest b-grid locations |
| 322 |
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v-stress under ice at southwest b-grid locations |
| 323 |
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residual shortwave under ice at tracer point |
| 324 |
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heat flux (less shortwave) at tracer point |
| 325 |
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freshwater flux at tracer point |
| 326 |
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salt flux at tracer point |
| 327 |
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| 328 |
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=========================================================== |
| 329 |
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| 330 |
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6a. ocean model receives 5b. and steps forward by deltatimestep |
| 331 |
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initially hardwired to 20 minutes |
| 332 |
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| 333 |
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6b. ice model receives 5a. steps forward by deltatimestep |
| 334 |
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initially hardwired to 20 minutes |
| 335 |
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| 336 |
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=========================================================== |
| 337 |
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| 338 |
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LOOP to 5a. and 5b. |
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